Vacuum-pump



K. D. SMITH.

VACUUM PUMP.

APPLICAHON FILED SEPT. 7, 1915.

Patented July 1% 19210 2 SHEETSSHEET l- JNV Karl D Sm/L h K. D. SMITH.

VACUUM PUMP.

APPLICATION FILED SEPT. 7. 1915.

192] m SHEET 2.

INVEN TOR.

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m m M w 0 m K P r@ W N F g. 9 4 Q0 Q0 0 I ATTORNEY.

EARL 1]. SMITH, GT BATTLE CREEK, MICHIlG-AN, ASSIGN'OR T UNIGIT STEAM PUMP COMEANY, G15 BATTLE CREEK, MTCHIGAl "VACUUM-PUMP.

Specification of Patented July to. roar.

Letters Eatent.

Application filed fieptember 7, 1915. Serial Silo. 493x745.

To all whom it may concern:

Be it known that T, KARL D. SMITH, a citizen of the United States, residing at Battle Creek, county of Calhoun, State of Michigan, have invented certain new and useful Improvements in Vacuum-Pumps, of which the following is a specification.

This invention relates to improvements n vacuum pumps.

My improvements are especially designed by me for embodiment in dry system pumps, that is, pumps for handling air only, and T have illustrated my improvements as l have embodied them for such purposes.

The main objects of my invention are:

First, to provide an improved pump in "which the passages and ports, valve seats, and valve chambers are easily formed and are readily accessible.

Second, to provide an improved pump in which the valves are in the form of flat annular steel disks with low hit or movement, making it practical to operate the machine at high speeds without noticeable noise, and at the same time one having a large tree portage.

Third, to provide an improved pump which retains its etiiciency when operated at high speeds.

a Further objects, and objects relating: to structural details, will definitely appear from the detailed description to follow.

l accomplish the objects of my invention by the devices and means described n the followings; specification. The invention is clearly defined and pointed out in the claims.

t structure 'wl'lich is a preferred embodiment of my invention is clearly illustrated in the accom.panyingdrawing, forming a part of this specification, in which:

Figure T is a side view of" a pump embodying the features of my invention, a portion of the tlv wheel being brolren away.

l ig. TT is a vertical central section on it line cormspondin; to line 2-i2 of Fig. l, the cranlt shatt, connecting rod, and piston pin being" shown in full lines.

Fig. ll'l is a horizontal section on aline corresponding to line of Fig. Tl through the air intalre passage.

Fig. TV is a horizontal section on a line corresponding to line lof Fig. ll. showing the arrangement oi the inlet passages and the cylinder ports.

Fig. V is a horizontal section on a line corresponding to line -5 of Fig. H showing the arrangement of the discharge passa es.

ig. V1 is a detail vertical section on a line corresponding to line 66 of Fig. V.

Fig. VTT is a perspective View of one of the valves.

Tn the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawings, the cylinder 1 is mounted upon the crank case 2 to open therein. The crank case is provided with a suitable supporting base 8. The cylinder has an annular intake passage 4 at its outer endiwith inlet openings 5 and a plurality of discharge openings 6 open at the end of the cylinder, which is faced oil fiat to receive the cylinder head. The cylinder head is built up of plate-like sections or members 7, 8 and 9, the member f being the inner member or that adjacent the cylinder, the member 8 an intermediate member, and the member 9 the outer member of the head. These members, When assembled, are secured to the cylinder by means of the head bolts 10. The inner member 7 is plate-like in form and is provided with a plurality of radially (lisposed inlet passages 11 communicating with the discharge passages 6 of the intake passage 4.. The member 7 has an annular valve seat 12 for the inlet valve 13 on its inner face. The passages 11 open into this valve seat to be closed by the valve when it is seated, as shown in Fig. ill. The inner head member Tis also provided withcylinder orts 1t grouped within the inlet passages.

on Figs. .lT-and TV. The intermediate member 8 has an annular recess 15 in its inner face constituting a chamber for the inlet valve 13. This chamber embraces the cylinder ports lei and also the inlet ports ll. The intermediate member 8 has an annular valve seat 16 on its outer face for the annular discharge-valve l7. and is provided with discharge passages 18 opening into the valve seat. The outer head member 9 has a recess 19 in its inner face constituting a chamber for the discharge valve and is provided with a central discharge opening 20 adapted to deceive a discharge pipe.

The valv l3 and 17 are in the form of Mill its

annular disks of steel. The diameters'of the valves are somewhat less than the diameters of the valve chambers, so as to allow the air to pass around and through the valves. The larger diameters of the valve chambers also permit, limited lateral movement of the valves, so that the valves and the valve seats wear evenly, and also it prevents any binding or wedging action, the valve floating freely in the valve chambers.

I preferably provide seating springs 21 disposed at intervalsaround the valves. The head members 8 and 9 have bore-like seats 22 therein adapted to receive and support the springs. These valves are comparatively thin, but at thesame time are sufficiently thick to prevent any springing of the valves and toinsure durability.

By thus forming the head of sections or members the ports and passages may be readily formed and the parts conveniently assembled, making the structure economical to produce and also providing free portage for the air. The valves have but little life and are practically noiseless in operation. At the same time, the structure may be operated at high speed without impairing the efliciency of the pump, which not infrequently occurs in pumps of this character owing to the valves fluttering and failing to seat properly at high speeds.

The piston 23 is comparatively long and has a bearing portion 24 at its inner end which keeps the piston in line and also prevents oil being carried above the cylinder.

The connecting rod 25 is connected to the cross head pin 26 oscillating in the bearings 2'4 on the piston, although this may be varied as desired.

The crank shaft 28 is supported in suitable bearings in the bearing members 29' and 30 arranged in alined openings'in the crank case.

The bearing member 29 is extended to support the flywheel end of the crank shaft andis provided with'oil passages 31 adapted to receive the splash from the crank arms and deliver to the hearing. A return passage 32 is provided for the lubricant.

To insure efficient lubricating of the crank shaft an oil cup33 is provided, which may be filled with Waste, permitting the lubricant to drip into the annular recess 34 below the cup.

As is'well understood, it is necessary to provide so-called breathing openings for the, crank case, andto prevent the escape of thelubricant through these openings I provide the bearing member 30 with a baflie chamber 35 having a conical inner wall 36 providedwith a central opening 37. About this openlng is an inwardly projecting flange 38 and an outwardly projecting flange 39. The outer wall 40 of this baflie chamber has annular flanges 41 and 42, the flanges being concentric with the flang'e39 of the inner wall and the flange 43 thereof. These flanges provide a zig-zag baffle passage so that the oil is collected from the air before it reaches the openings 44 of the baffle chamber. The baffle chamber is provided with a small opening 45 at the bottom so that the collected oil may drip back into the oil well 46 of the crank case. I, however, call attention to the embodiment of my invention shown in my copending application, Serial No. 152,810, filed March 6, 1917.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a structure of the class described, the combination of a cylinder having an annular intake passage at its outer end provided with discharge openings at the end of the cylinder, a cylinder head comprising an inner plate-like head member having an annular inlet valve seat on its outer face and aplurality of radially disposed inlet passagescommunicating with said discharge openings of said intake passage and opening into said valve seat, and a plurality of cylinder ports grouped within said inlet passages, an intermediate plate-like head member having an annular discharge valve seat on its outer face and an annular recess in its inner face constituting an inlet valve chamber into which said cylinder ports open, said intermediate head member being also provided with discharge ports opening into said discharge valve seat, an outer head member having a recess in its inner face constituting a discharge valve chamber, said chamber being provided with a discharge opening, annular disk-like valves arranged in said valve chambers to coactwith said valve seats, the diameters of said valves being such as to permit a limited lateral movement on their seats and the passage of air around and through the valves, and coiled seating springs for said valves, said intermediate and outer head members being provided with bore-like seats'for said springs alined with said valves.

2. In a structure of the class described, the combination of a cylinder having an annular intake passage at its outer end provided with discharge openings at the end of the cylinder, a cylinder head comprising an inner plate-like head member having an annular inlet valve seat on its outer face and a plurality of radially. disposed inlet passages communicating with said discharge openings of said intake passage and opening into said valve seat, and a plurality of cylinder ports grouped within said inlet passages, an intermediate plate-like head member having an annular discharge valve seat'on its outer face and an annular recess in its inner face constituting an inlet .valve chamber into which said cylinder ports open, said interee ear mediate head memberv being also providedv 3. In a structure of the class described, the

, combination of a cylinder having an annular intake passage at its outer end, a cylinder head comprising an inner head member having an annular inlet valve seat on its outer face and a plurality of inlet passages communicating with said intake passage and opening into said valve seat, and a plurality of cylinder ports, an intermediate head member having an annular discharge valve seat on its outer face and an annular recess in its inner face constituting an inlet valve chamber into which said cylinder ports open, said intermediate head member being also provided with discharge ports opening into said discharge valve seat, an outer head member having a recess in its inner face constituting a discharge valve chamber, said chamber being provided with a discharge opening, annular disk-like valves arranged in said valve chambers to coact with said valve seats, and coiled seating. springs for said valves, said intermediate and outer head members being provided with bore-like seats for said springs alined with said valves.

4. In a structure of the class described, the combination of a cylinder having an annular intake passage at its outer end, a cylinder head comprising an inner head member having an annular inlet valve seat on its outer face and a plurality of inlet passages com municating with said intake passage and opening into said valve seat, and a plurality of cylinder ports, an intermediate head member having an annular discharge valve seat on its outer face and an annular recess in its inner face constituting an inlet valve chamber into which said cylinder ports open, said intermediate head member being also provided with discharge ports opening into said discharge valve seat. an outer head member having a recess in its inner face constituting a discharge valve chamber, said chamber being provided with a discharge opening, and annular disk-like valves arranged in said valve chamber to coact with said valve seats.

5. In' a structure of the class described, the combination of a cylinder, a cylinder head comprising an inner head member having an annular inlet valve seat on its outer face and a plurality of inlet passages opening into said valve seat, and a plurality of cylinder ports, an intermediate'head member having an annular discharge valve seat on its outer face and an annular recess in its inner face constituting an inlet valve chamber into which said cylinder ports open, said intermediate head member being also provided with discharge ports opening into said discharge valve seat, an outer head member having a recess in its inner face constituting a discharge valve chamber, said chamber be ing provided with a discharge opening, annular disk-like valves arranged in said valve chambers to coact with said valve seats, and coiled seating springs for said valves, said intermediate and outer head members being provided with bore-like seats for said springs alined with said valves.

6. In a structure of the class described, the combination of a cylinder, a cylinder head comprising an inner head member having an annular inlet valve seat on its outer faceand a plurality of inlet passages opening into said valve seat, and a plurality of cylinder ports, an intermediate head member having an annular discharge valve seat on its outer face and an annular recess in its inner face constituting an inlet valve chamber into which said cylinder ports open, said intermediate head member being also provided with discharge ports opening into said discharge valve seat, an outer head member having a recess in its inner face constituting a discharge valve chamber, said chamber being provided with a discharge opening, and annular disk-like valves arranged in said valve chambers to coact with said valve seats.

7. In a structure of the class described, the combination of a cylinder, a closed crank case into which the cylinder opens, said crank case being provided with a splash oil well, a piston, a crank shaft, said crank shaft case having alined openings adapted to receive crank shaft bearing members, and crank shaft bearing members, one of said bearing members having a bafiie chamber therein open to the atmosphere and provided with a conical inner wall having a central opening therein with inwardly and outwardly projecting bafile flanges about the opening and a surrounding annular flange, the outer wall having inwardly projecting annular flanges concentric with the flanges of the inner wall and disposed to co act with said flanges of said inner wall to provide zigzag bafiie passages,

8. in a structure of the class described, the combination of a cylinder. :1 piston, a crank 'case into which the cylinder opens, said crank case being provided with a splash oil well and with a battle member opening, and a bafiie member arranged in said crank case opening and having a battle chamber therein open to the atmosphere and provided with a conical inner wall having a central opening therein with inwardly and outwardly ing into said valve seat, and a plurality of cylinder ports, an intermediate head mem ber having an annular discharge valve seat on it outer face and discharge ports opening into said discharge valve seat, said inner and intermediate head members being formed to inclose between them an annular inlet valve chamber into which said cylinder ports open, an outer head member having a recess in its inner face constituting a dischar e valve chamber, said chamber being provided with a discharge opening, annular disk-like valves arranged 'in said valve chambers to coact with said valve seats, and coiled seating springs for, said valves, said intermediate and outer head members being provided with -"bore-like seats for said springs alined with said valves.

10. In a structure of the class described, the combination with a cylinder, of a head therefor comprising a pair of superimposed head members, the inner head member having a valve seat on its outer face, a plurality of inlet ports opening into said valve seat, and a plurality of cylinder ports, said head members being formed to inclose between them an inlet valve chamber into which the cylinder ports open, the superimposed member being provided with a discharge port opening into said inlet valve chamber, a valve for said discharge port, and a disk-like inlet valve.

11. In a structure of the class described, the combination of a cylinder, a cylinder headcomprising a pair of superimposed head 'members formed to inclose between them an annular inlet valve chamber, the

inner head member having an annular inlet a valve seat in its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports'opening into said inlet valvechamber, the superimposed head member being provided with an annular discharge valve seat and discharge ports opening into said valve seat and to said inlet valve chamber, annular disk-like valves arranged to coact with said valve seats, and seating springs for said valves.

12. In a structure of the class described, the combination of a cylinder, a cylinder head comprising a pair of superimposed head members, the inner head member having an annular inlet valve seat in its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports, the superimposed head member being provided with a discharge port, said head members being formed to inclose between them an annular inlet valve cham' ber into which said cylinder and discharge ports open, a valve for said discharge port, and an annular disk-like valve arranged in said inlet valve chamber to coact with said valve seat.

13. In a structure of the class described, the combination of a cylinder, a cylinder head comprising an inner head member having an annular inlet valve seat in its outer face and a plurality of inlet passages opening into sa d valve seat and a plurality of cylinder ports, a second head member provided with an annular discharge valve seat and discharge ports opening into said discharge valve seat, said head members being formed to inclose between them an annular inlet valvechamber into which said cylinder ports open, annular disk-like valves arranged in said valve chambers to coact with said valve seats, and seating springs for said valves. I v

14. In a structure of the class described, the combination of a cylinder, a cylinder head comprising an inner head member having an annular inlet valve seat on its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports, a second head member having an annular discharge valve seat and discharge ports opening into said discharge valve seat, said head members being formed to inclose between them an annular inlet valve chamber into which said 0 linder ports open, and annular disk-like val ves coacting with said seats.

15. In a structure of the class described, the combination with an open ended cylinder, of a cylinder head'detachably secured thereto and comprising superimposed members coacting to form an inlet valve chamber, an inlet port communicating with said inlet valve chamber, a valve in said inlet valve chamber, a port establishing communication between said inlet valve chamber and 1 said cylinder, the superimposed member being provided with a discharge valve chamber, and ports establishing communication between said inlet valve chamber and said discharge valve chamber, a valve in said dis- 20 s F i. J

annular discharge valve seat on its outer face and discharge ports opening into said discharge valve seat, said head members being formed to inclose between them an inlet valve chamber into which said cylinder and discharge ports open, and annular disk-like valves arranged to coact with said valve seats, one of said head members being provided with a central. cylindrical part constituting guide for said inlet valve.

17. in a structure of the class described, the combination with a cylinder, of a head therefor comprising superimposed head members, the inner head member having an annular inlet valves-eat on its outer face, a plurality of inlet passages opening into said valve seat, and a plurality of cylinder ports, the superimposed head member having a discharge port, said head members being formed to inclose between them an inlet valve chamber into which said cylinder and discharge ports open, a valve "for said discharge port, and an annular disk-like inlet valve arranged to coact with said inlet valve seat, one or said head members being prvided with a cylindrical part constituting a guide for said inlet valve. A

18. In a structure of the class described, the combination with a cylinder, of a head therefor comprising superimposed head members, the inner head member having a valve seat on its outer face, a plurality of inlet ports opening into said valve seat, and a plurality of cylinder ports, said head members being formed to inclose between them an inlet valve chamber into which the cylinder ports open, the superimposed member being provided with a discharge port opening into said inlet valve chamber, a valve for said discharge port, and a dish-like inlet valve.

19. lin a structure of the class described, the combination of acylinder, a cylinder head comprising superimposed head members formed to inclose, between them an annular inlet valve chamber, the inner head member having an annular inlet valve seat in its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports opening into said inlet valve chamber, the superimposed head member being provided with an annulardischarge valve seat and discharge ports opening into said valve seat and to said inlet valve chamber, annular disk-like valves arranged to coact with said valve seats, and seating springs for said valves.

20. in a structure of the class described, the combination of a cylinder, a cylinder head comprising superimposed head members, the inner head member having an annular inlet valve seat in its outer face and aplurality of cylinder ports, the superimposed head member being provided with a discharge port, said head members being charge ports opening .termediate chamber discharge port, and an annular disk-like valve arranged in said inlet valve chamber to coact with said valve seat.

21. in a structure of the class described, the combination of a cylinder, a cylinder head comprising an inner head member having an annular inlet valve seat in its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports, a second head member provided with an annular discharge valve seat and discharge ports opening into said discharge valve seat, said head members being formed to inclose between them an annular inlet valve chamber into which said cylinder ports open, annular disk-like valves arranged in said valve chambers to coact with said valve seats, and seating springs for said valves.

22. In a structure of the class described, the combination of a cylinder, a cylinder head comprising an innerhead member having an annular inlet valve seat on its outer face and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports, a second head member having an annular discharge valve seat and discharge ports opening into said discharge valve seat, said head members being formed to inclose between them an annular inlet valve chamber into which said cylinder ports open, and annular dislolike valves coacting with said seats.

23. In a structure oi the class described, the combination of a cylinder, a headcomprising an inner head member having an annular inlet valve seat on its outer face, and a plurality of inlet passages opening into said valve seat and a plurality of cylinder ports, a superimposed head member having an annular discharge valve seat and disinto said discharge valve seat, said head members being formed to inclose between them a valve chamber into which said cylinder and discharge ports open, a cap member, said cap member and superimposed head member belng formed to inclose between them a discharge valve chamber, annular disk-like valves arranged in said valve chambers to coact with said valve seat, and seating springs for said valves. said superimposed and cap members being adapted to support said springs.

24. In a structure of the class described,

the combination with an open ended cylinder, of a head detachably secured thereto and provided with three superimposed chambers, the lower chamber constituting an inlet chamber, the upper chamber constituting a discharge valve chamber, and the inconstituting an inlet valve chamber, said head being provided with inlet, outlet, and cylinder ports establishing communication between said inlet valve chamber and said inlet chamber, dis charge chamber, and cylinder, respectively, and valves for closing the upper ends of said inlet ports and said discharge ports.

25. In a structure of the class described, the combination with an open ended cylinder, of a head therefor comprising an inner member and an outer member coacting to provide an inlet valve chamber, a valve seat formed in the bottom of said inlet'valve chamber, an inlet valve, said inner member being provided with inlet ports communicating with said inlet valve chamber and opening into said valve seat, and a port forming communication between sa1d inlet valve chamber and said cylinder, said outer memher being provided with discharge ports communicating with said inlet valve chamber, and a valve for said discharge ports, substantially as described.

26. In a structure of the class described, the combination with an open ended cylinder, of a head detachably secured thereto provided with two chambers, one of said chambers constituting a discharge valve chamber and the other of said chambers constituting an inlet valve chamber, a valve seat in each of said chambers, inlet ports communicating with said inlet valve chamber andopening into the valve seat therein,

Lesa-ea? discharge ports extending from said inlet valve chamber to said discharge valve chamher and opening into the valve seat in said discharge chamber, and a valve for each of said valve seats, said head being provided with a port establishing communication between said inlet valve chamber and said cylinder, substantially as described.

27. Ina structure of the class described, the combination with an open ended cylinder, of-a' cylinder head detachably secured thereto and comprising superimposed members coacting to form an inlet valve chamber, an inlet port communicating with said inlet valve chamber, a valve in said inlet valve chamber, a port establishing communication between said inlet valve chamber and said cylinder, the superimposed member being provided with a discharge valve chamber, and ports establishing communication between said inlet valve chamber and said discharge valve chamber, a valve in said discharge valve chamber, and means for urging said valves to their closed position.

In witness whereof, I have hereunto set my hand and seal in the presence of two' witnesses.

KARL D. SMITH. [L. s.] Witnesses:

E. M. SMITH, A. S. Common 

